|Riassunto in Inglese:|
The most commori and serious diseases which occur in ltaly during storage and marketing of citrus fruit are green and blue
moulds incited respectively by Peniciltium digitatum ?iftd P. italicunr. These diseases can cause significant economic lo-sses
during storage andLansport. Volatiles compouads produced when fruit are spoiling represent a rapid and early indication of the
op"oùing déterjoration.-Thusc an be considereda promising field of applicationf or electronicn ose technologya s previously
réported,w here the instrument'ss ensìbilityw as not tested.O bjectiveo f our researchw as to investigatet he sensibilityo f a quartz
piezoelectric electronic nose (Merlino LibraNose, Technobiochip ltaly) to detect low amount of fruit affected by P. digitatum
à*ong sound fruit. Mature fruits (primofiore crop) from Citrus limon (L.) Burm "Femminello siracusano" were used in this
Sound and sound plus infected fiuitÀ were allocated respectively in two different Plexiglas air isolated cabinets
(cóntrot vs cabinetc ontainingi nfectedf ruit). The percentageso f infectedf ruit utilized were 1 and SVo.Thes oundf ruit usedt o fill
the shelves of cabinets were previously treated with the fungicide Imazalil (1000 ppm a.i.) to avoid mould spreading and the
consecutivei ncreasingi n the percentageo f infection. Measureso f volatiles compoundsw ere carried out in the atmosphereo f
cabinet for four days after each percentage of infected fruit was fansferred. Similar detections were carried out in the control
cabinet.T he averagev alue of 6 sensor'si ignal of the infecteds amples,i ncreasedo f the 4.9Vow ith respectt o the control for the
lower infection rate, reaching a value of Z2jfto for the higher one (57a). Moreover, multivariate classification (PLS-DA) was able
to discriminatew ith good performanceb etweenv aluesr egardings ounda nd infectedf ruits.
Effect of Ultra Violet (UD on Mycelial Growth and Postharvest Infection of Peach FruÍts by Botrytis cinereu o;lad
Azzeddin M. Alawamil, Ibrahim A.El-samra2, Awad M. Hussein3, Saad M. Shama2
rDept. of plant protection, Fac. Agric., Omar Al-mukhtar Univ., El-Beida, Libya.
'Agricultural Botany Dept., Fac. Agric., Saba Basha, Alex. Univ. Egypt.
'Pomology Dept., Fac. Agric., Alex. Univ. Egypt
The effect of UV radiation at 360 nm on mycelial growth of B. cinerea atd R. stolonifur andt heir postharvestd ecayo n peach
fruits. was investigated. Data proved that exposing for 5-6 min. was significantly the most effective dose in decreasing the
mycelial g1owth of boih tested firngi as compared with the other exposure doses. Exposing peach fruits to UV-light significantly
decreased decay of inoculated peach fruits. As regards, exposure time for 6 min gave the best results in suppressing the
postharvestd eciy of peaches.S light differencesi n weight loss valuesw ere detectedi n fruits inoculatedw ith -R.s tolonifer and
èxposed to UV at difîerent exposure periods compared with uninocslated fuuits or those inoculated with 8. cinerea. Exposing
inoculated fruits with each of ihe testeà fungi to Uv-irradiation slightly affected the percentage of soluble solids content' On the
other hand, exposingh ealthy fruits for 24 min. significantly decreaseds oluble solids contenta s comparedw ith untreatedf ruits
or thosee xposedfo r 6 min.